Improvement in siphon propeller-pumps



EMILY E. TASSEY.

SIPHON PRo-PELLER-PUMP.

Patented Dec.5.1876.

UNITED STATES EMILY E. TASSEY', OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN slPHoN'PRoPELLER-PUMPS..

Specification forming part of Letters Patent No. l 84,996, datedDecember 5, 1876; application filed May 27, 1876.

are suflicientto enable any person skilled in" the art or science towhich it most nearly appertains to make and use my said inventionwithout further invention or experiment.

The nature of my invention is to provide means of .dischargin g largeportions of wateras from a coft'er-dam-into the river; and consists of abent tube, in the end ot' which, in the bottom of the coier-dam, is'ascrew-propeller or other mechanical device for raising water, andutilizes the atmospheric pressure in sustaining the water in thatportion of the tube air-tight above the water-line, thus holding thewater in equilibrio in the two equal arms ofthe bent tube. In order toaccomplish this purpose, I employ a bent tube containing ascrew-propeller, moved by steam or other power, and a jet of compressedair, introduced near the base ofthe discharging-arm.

Referring to the drawings to more fully illustrate and describe myinvention, Figure 1 is a side elevation.

Similar letters indicate in each of the figures like parts.

S. represents the steam-engine or other power employed to rotate thescrew-propeller by means of the crank P. A is the screw-propeller. W isthe water-line B is the mouth of the tube, a fewinches above thewater-line. V is that portion ofthe tube above the waterline, in which,after the air is displaced, the water is sustained by-atmosphericpressure.

"Tis a small tube, reaching from the engine to the base of thedischarging-arm of the siphon, introducing a jet of compressed air,which forces the water upward in the dischargingarm, both by mechanicalpressure and by its natural expansion and ascension; also, according tothe law of transmitted pressure, as shown in hydraulic machines, theforce ofthe pressure of theair is multiplied by the number of times thearea of the small air-tube is contained in the'area ot' the water-tube.-Let the area ot' the air-tube be one inch, and its force live pounds,and the area of the waterline. Then is the water from A toE inequilibrio. Above the water-line it is sustained by atmospheric pressureto any height lessv than thirty feet.

The progress ofthe water in the tube is that ot' a wave, and it isproduced by the same causes that produce the wave, viz., unequalpressure on a body of water. the pressure of the screw; second, the jetof air; third, the suction at V; fourth, the gravitation of the waterfrom V to E.

The velocity ot' the tlow in a siphon is in proportion to the height ofthe source above that of the discharge, and conversely. The greatervelocity represents the higher source. At the start, when thecoffer-dam-is full, the curved tube above the water-line being full, itis easy to give the water a velocity 'equal to the production of a newvirtual water-level at the point L, ten feet above the water-line. Ifthe velocity is sixteen and one-twelfth feet per second vertically, thewater from V to`E will full, the power of the screw and air-jet, withthe accumulated force of thevwater in motion, will, when it is nearlyempty, raise that low water ten feet, or to the descending virtuallevel. With the last foot of water carried up the tube, the air rushesup to lill the vacuum at V, and the water falls from V to the waterleveloutside; also, when a strong current of water is convenient, the end ofthe discharge ts motion There are, first,

pipe or tube may be placed in that current,

thus aiding the discharge by the suction of the current; also, thedischarge-tube may terminate at E, a point of nearly the same level asthe bed of the Colfer-dam, and on the end of thetube, at or near E,there shall be placed a valve, opening outward, to prevent the returnofthe water to the coder-dam.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

In combination with the curved tube, ar-,

ranged as described, the propeller-pump in the receiving end, Vand theair-supply pipe in the discharging end of the tube, as and forY thepurpose described. l

In Witness whereof I have hereunto set my hand.

EMILY E. TASSEY.

Witnesses:

A. G. JOHNSTON, JAMES BLAGK.

